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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab77a1cb496e9d949f484c9025f9c684409a38b38bb85df3e65b6d9664008cf7' 
  AND token = 'rjzMeKefO9ml0vbvRILlMP3NOhr9MR5X+QZaN6SovO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}